The mainstream solution is a 108kVA/108kV configuration. To meet different test capacity requirements, there are usually two configuration approaches, as follows:
I. Main Configuration Details
(1) Standard Configuration (108kVA/108kV)
Core components: This configuration typically includes one approximately 5.5-6kW output frequency converter, four reactors (each with a specification of 27kVA/27kV), a 6kVA excitation transformer, and a 110kV capacitor divider.
Application scope: This configuration is suitable for most conventional commissioning and preventive testing scenarios. Typical test capabilities include: 10kV cables with a cross-sectional area of 300mm², a length not exceeding 2.2 kilometers; 35kV cables with the same cross-sectional area, a length not exceeding 0.8 kilometers; and power transformers, switches, and transformers with a capacity not exceeding 40,000kVA, etc., for 35kV power.
(2) Expansion Configuration (135kVA/108kV)
Core components: To meet larger capacity test requirements, this configuration will upgrade key component specifications. The power of the frequency converter is approximately 7.5kW, the capacity of each reactor is increased to 33.75kVA/27kV (4 sections), the capacity of the excitation transformer is increased to 7.5kVA, and the divider remains 110kV.
Application scope: It mainly enhances the testing capability for long cables. For example, it can test 10kV cables with a cross-sectional area of 300mm² with a length extension to approximately 3 kilometers, 35kV cables of the same cross-sectional area with a length of approximately 1 kilometer, or testing capacity not exceeding 31,500kVA for 35kV transformers.
II. Key Points for Selection and Recommended Steps
When choosing the appropriate configuration scheme, the following points should be focused on:
Firstly, determine the test object: This is the fundamental for selection. Transformers, switches, etc., have small electrical capacities, and the standard 108kVA scheme is usually sufficient. If the main test is for long-distance power cables (large electrical capacity), then a 135kVA or larger capacity scheme must be prioritized to ensure the device has sufficient output current to drive resonance.
Calculate and verify necessary parameters: For capacitive loads such as cables, it is recommended to estimate using the formula: Test current (I) = 2 × π × Test frequency (f) × Test capacitance (C) × Test voltage (U). Ensure that the rated output current of the selected device is greater than the calculated result.
Pay attention to the suitability of the equipment for the site: The reactors and transformers of the device are mostly dry epoxy cast, and the weight of each section is usually between 45-55 kilograms, facilitating manual assembly. At the same time, note that the input voltage of the frequency converter is 220V or 380V, to match the on-site power supply conditions.
Confirm functions and safety protection: High-quality devices should have complete overvoltage, overcurrent, and flashover protection functions. Automatic tuning and flexible operation modes (fully automatic/manual) can greatly improve the efficiency of on-site testing.
Refer to authoritative standards and specifications: The manufacturing, testing, and use of the device should follow relevant national standards and power industry regulations, mainly including:
Equipment commissioning test standards: GB 50150-2016 “Electrical Installation Engineering Electrical Equipment Commissioning Test Standards”
Preventive test procedures: DL/T 596-2021 “Power Equipment Preventive Test Procedures”
Device technical general conditions: DL/T 849.6-2016 “General Technical Conditions for Specialized Testing Instruments for Power Equipment – Part 6: High-Voltage Resonance Test Device”
High-voltage test technical guidelines: GB/T 16927.1-2011 “High Voltage Test Technology – Part 1: General Definitions and Test Requirements” III. Final Selection Recommendation
It is recommended to first list in detail the main types of tested equipment, voltage levels, and key parameters (such as the common length and cross-sectional area of cables, and the larger capacity of transformers). Then, carry this requirement list and go to at least two to three reputable manufacturers for formal technical consultation. The targeted configuration plans and quotations provided by the manufacturers after professional calculations will be the most reliable basis for making the final decision.
Post time: Feb-04-2026